[sdiy] Just came across this...

[Scott E.]

Fun stuff.

This design used:

MC799P Dual Buffer (1)
MC791P Dual Flip-flop (3)
MC724P Quad two-input gate (2)
2N5129 NPN (6)
2N5139 PNP (1)
2N4871 UJT (1)
2N4351 ??? (1)
MPS6523 PNP (1)

I think all the ICs are RTL stuff.

If this eBay item does not work, all of my best to the buyer to find parts.

Scott Evans
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Grant Richter wrote:
> I believe that would be Don Lancaster's "Psych-Tone" aleatoric synthesizer.
> 1971 sounds about right, and the contact paper was pictured in the original
> article. A 32 stage PRSS with decoders, can't remember if it's TTL or CMOS.